Rubblization of Portland Cement Concrete Pavements

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Rubblization of Portland Cement Concrete Pavements

Size: 2 MB | Format: PDF | Publisher: TRB | Year: 2006 | pages: 94

Rehabilitation of existing pavements is a top pavement priority facing local, state, and federal transportation agencies. The use of hot-mix asphalt (HMA) overlays presents a long-term and economical solution to the pavement rehabilitation problem. HMA overlays restore rideability, improve the long-term functional pavement performance as well as increase the structural capacity of the existing pavement system. Due to the expense, time and traffic delay involved in concrete pavement restoration (CPR) and reconstruction, resurfacing of portland cement concrete (PCC) pavements with an HMA overlay is a very appealing option for many agencies. However, existing, worn-out PCC pavements present a particular problem for rehabilitation due to the likelihood of reflection cracking when an HMA overlay is placed. The reflection cracking problem must be addressed in the HMA overlay design phase if long-term performance of the overlay is to be achieved. The objective of rubblization is to eliminate reflection cracking in the HMA overlay by the total destruction of the existing slab action of the PCC pavement. This process is normally achieved by rubblizing the slab into fragments. Temperature and/or reinforcing steel, if present in the PCC pavement, is generally fully debonded from the concrete by this approach. The rubblization process is applicable to all types of existing PCC pavements. The objective of this paper is to provide an overview of current design and construction guidelines specific to the PCC rubblization process. A procedure is presented for determining the required thickness of an HMA overlay placed over rubblized PCC slabs as well as guidelines for construction.

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